JPS60167658A - Manufacture of stator for induction motor - Google Patents

Abstract

PURPOSE:To eliminate the influence of machined burr or strain to the accuracy of an inserting hole of a rotor by coupling adjacent poles by a stepdown portion from the inner periphery of a pole shoe, securing the poles to a stator yoke and then delecting the coupling part. CONSTITUTION:Four poles 8 are coupled with each other at portions 8a' stepped down from the inner peripheral surface of a pole shoe 8a at both sides of the pole shoe 8a. A stator yole 9 is formed substantially in a rectangular frame shape, and the opposite ends of the shoes 8a of the poles 8 are pressfitted fixedly in the state that the four poles 8 are coupled with each other with a recess formed at the inner side. Then, the portion 8a' for coupling the four poles 8 secured to the yoke 9 is separated to comlete the stator.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method of manufacturing a stator for an induction motor.

Conventional Structure and Problems The inventors of the present invention have previously made many improvements to the stator of an induction motor in order to increase the efficiency of the motor. An example of this will be explained below with reference to FIGS. 1 and 2.

FIG. 1 is a plan sectional view showing an intermediate stage in the manufacturing process of a stator for an induction motor, which is the first step of the present invention.

1 in the figure is the stator core, with a ball shroud 2 at the tip.
It has a configuration including four magnetic poles 2 each having a shape a. The four magnetic poles 2 are a part 21L of the ballsch part 2a.
'[are connected to each other.

It is a three-piece stator yoke, and the four magnetic poles 2 of the stator core 1 are press-fitted into the inner peripheral portion. Moreover, the magnetic pole 2
A nine-winding frame 6 is fitted around which a winding 4 is wound.

The stator configured as described above has the ball shingle part 2a.
Part 2, / is separated by post-processing, and the state shown in Figure 2 is completed. In the stator 1 completed in this way, each of the four magnetic poles 2 is independent, so leakage flux to adjacent magnetic poles is reduced, and a highly efficient electric motor can be provided. In the configuration, when separating the part 2a' of the ball shingle part 2a, as shown in FIG.
As can be seen, machining cracks and machining distortion occur on the inner circumferential surface, and as a result, there are problems in that it is difficult to maintain the accuracy of the rotor insertion hole 6 and the rotor (not shown) does not rotate smoothly. Ta.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems.
It is an object of the present invention to provide a method for manufacturing an identifier in which machining cracks and machining distortions that occur when parts connecting adjacent magnetic poles are removed do not affect the accuracy of a rotor insertion hole.

Structure of the Invention In order to achieve the above-mentioned object, the present invention connects adjacent magnetic poles at a stepped portion from the inner peripheral surface of a part of the ballsche formed on each, and fixes each magnetic pole to a stator yoke. This method of manufacturing a stator includes the step of removing the connecting portion after doing so.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In FIG. 3, reference numeral 7 denotes a stator core, which is composed of four magnetic poles 8 each having a ballsch portion 81L formed at its tip. 8 magnetic poles of 4 front b pins, 8 pieces of the ball shingle part
& are connected to each other at portions 8a' stepped down from the inner circumferential surface of the bowlche portion 8a. 9#
'i Identifier yoke is formed in the shape of a rectangular frame, and the four magnetic poles 8 are connected to each other in the concave portion formed on the inner side of the yoke. The ends are press-fitted and fixed. Next, cut off the portion 81L' that connects the four magnetic poles 8 fixed to the stator yoke 9,
The stator as shown in FIG. 6 is completed. In addition, 10 in a figure shows a winding, 11 shows a winding frame, and 12 shows a rotor insertion hole.

As shown in Figure 4, machining parity and machining distortion occur during the above-mentioned separation, but these machining paris and machining distortions are caused by the stator (
(not shown), that is, the part that directly affects the rotation of the magnetic
This is not a problem because it occurs on the inner circumferential surface of the tube.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention provides a method of press-fitting a stator core in which adjacent magnetic poles are connected at a stepped portion from the inner circumferential surface of a part of the ballsche into a stator yoke. This method of manufacturing an induction motor stator is characterized in that after fixing, the connecting portion provided at the stepped portion is removed, and the portion connecting each magnetic pole is stepped from the inner circumferential surface of a part of the ballsche. By providing it in the fallen part, machining cracks and machining distortions that occur when the connecting part is removed do not affect the accuracy of the stator insertion hole, which is highly effective.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the state of the manufacturing process of the stator, which is the premise of the present invention, FIG. 2 a is an enlarged view of the same main part, and FIG. FIG. 3 is a plan view showing the state of the manufacturing process of a stator according to an embodiment of the present invention, and FIG. 4a
4 is an enlarged view of the same main part, FIG. 4 is an enlarged view of the main part when the stator is completed, and FIG. 6 is a plan view of the completed stator. 7... Stator core, 8... Magnetic pole, 8a
・・・・・・Part of Borsch, S a /・・・・・・
Connection part, 9... Stator yoke, 1o...
・Winding, 11... Winding frame, 12... Rotor insertion hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 (α)

Claims (1)

[Claims] a stator yoke; and a stator yoke fixed to the identifier yoke and protruding toward the inside of the stator yoke;
Moreover, the method for manufacturing a stator is provided with a ball shingle portion on the inner periphery, a plurality of magnetic poles made of a laminated structure of a plurality of iron cores, and a stator winding wound around the magnetic poles. a step of connecting adjacent portions of the balls at a portion stepped down from the inner circumferential surface of the portion of the balls to form a magnetic pole;
A method for manufacturing an induction motor stator, comprising the steps of fixing the formed magnetic poles to a stator yoke, and removing an iron core connecting parts of the adjacent ballsches.